package main;


import java.util.*;
public class main2{

	public static void main(String[] args) {
		int arr[]=new int [5];
		String s=null;
		Scanner sc=new Scanner(System.in);;
		while(true){
			String choice =sc.next();
			try {
				if (choice.equals("arr")){
					int index =sc.nextInt();
					arr[index]=1;
				}
				else if(choice.equals("null")){
					s.length();
				}
				else if(choice.equals("cast")){
					Object o=new String("arr");
					
					//String line =sc.next();
					Integer value =(Integer) o;
				}
				else if(choice.equals("num")){
					String ss =sc.next();
					Integer.parseInt(ss);
				}
				else{
					break;
				}
				
			}
			catch(Exception e){
				System.out.println(e);
			}
		}
		sc.close();
	}
}

